Thermostatic control for auxiliary-air devices



. April 7, 1931.

G. A. BRUNELLE ET AL THERMOSTATIC CONTROL FIOR AUXILIARY AIR DEVICESFiled Feb.

BY ATTORNEYS.

INVENTCR as'ralv A Bea/vs; 4 CAM/L4: BIPwvsz-r;

Patented Apr. 7, 1931 uni-TED "STAT S i j AsTonA. BRUNELLE AND CAMILLEBRUNEEL, or sANrnANoIsco, oAmFoRNrA THnRMosTATio CONTROL nonAUXILItARY-AIR DEVICES I Applicatidn filed February 12, 1927. Seria1 No.1 6"7,"? 7 6.

This invention relates to auxiliary air supplying and mixing devices,such as are used with internal combustion motors, and refers moreparticularly to application Serial N 0. 122,411, filed by GastonA.Brunelle, July 14, 1926. a i I One of the objects of this invention isto improve 'upon the device, described by above mentioned application,thatwill respond to engine speed and regulate the auxiliary airintakeproportionally. y t V This invention. is designed and constructedto accomplish this by admitting more air at high speed and cutting downthe auxiliary air at low speed, thereby giving a bettercarburetingeifect', which in turn means a more economical and eflicient engine.

A particular advantage of the device. resides in the fact that hot airisfadmitted as auxiliary air instead of cold air. This will cause abetter mixture than cold air andgwill help to pick up and volatilizethat raw gas that tends to accumulate in the low points'in themanifoldi' 1 v A further advantage is a thermal control unit thatoperates in connection with the. auxiliary air intakeport and regulatesit acc ing to the heat of the engine. ,j

The combination. of the auxiliary air intakeport withthe thermal controlunit and the admission of preheated airintol theintake manifold,furnishes a combinationthat is new and produces effects that are highlysatisfactory in regard to economy and power.

It is observedfrom the foregoingthat'a resultant effect, coming fromacombination of the speed of the engine, and the heat of the engine, isutilized to control the auxil- V iary .pre-heated air admitted to theintake manifold. V

v It is to be understood that this auxiliary air is admitted to theintake'manifold between the carburetor and the intake valves, and whenso admitted augments the air content ofthe mixture andconsequentlyrarefies the mixture. This isdesirable atcertain engine speeds and heatsand is automatically obtained by our invention. 1

The above advantages, together with any and all subsequent onesdeveloped by the description, constitute'our invention which isdisclosed by the accompanying drawings. -Inthedr'awingsz w f Figure 1shows the invention as applied to anengine'; a o

Figure 21' shows a section on line 2-2 of Fiurelf f p igure 3 shows anyenlarged'section' ofthe, thermal control'u'nit. j

Referring now in detail to the drawings, in which 1 represents theintake manifold of the engine and 2 the exhaust manifold. Surrounding 1and 21s a sheath like member 7 3, which is held to-the engine 4 by. thehead bolt as at 5, and the manifold bolts, as at 5" and 5"; This sheathlikemember is shaped to form'an' oven opened atthe lower side as at 7 toslip over the intake manifold. Mount-- ed'f'o'n thetop side 8 of themember 3 is a 'chamberfdesignated 9 in its. entirety. Suitably connectedat one end tothe chamber 9 a'connection 1,0, the other end of whichsuitably joinstheflanged member ll. In,

vthis case the connection used is tubing, but

maybe flexible as the occasion demands.

lhe flan'ged' member 111 is interposed be tween the carburetor 12 andtheintake manifold 1. g It is found more convenient to introduce'it as aflanged member,but it'inay also be brought into the intake mani'foldbymeans of an opening in. the walls ofthe manifold anywhere between thecarburetor and the pointwhere the manifold branches to go to thecylinder portsi :The thermal control unit generally desi'gnated 9 iscomposed ofan upper plate 13 and a'lower plate 14,.which plate 14 isalso the top 7 plate of thefheating oven. Flangedly connected asat 15 tothe upper plate 13 is a sleeve M merit of the entire valve.

to join plate 14 as at 17 This construction furnishes the casing. Thetop plate 13 is provided with an outlet opening 18, which is screwthreaded as at 19 and takes a standard coupling 20, which in turnjoinsthe aforementioned pipe 10. I

Depending from plate' 13 and below the opening 18 is provided a unitgenerally designated 21, which is screw threaded and joined to plate 13as at 22. Contained within this unit is a valve member 23 shaped to fitinto the seat 24, which seat is a part of the unit 21. An annular space25 is provided by malting the diameter of the valve stem 26 smaller thanthat of the opening 27 in the member 21. A flange 28 formed on thebottom of the stem 26 serves as a stop for the upward move- Sma-llprotuberances 29 prevent the flange 28 from seating and permit air topass upthrough the annular space 25, although the valve is fully l' teProvided within valve 23 is another valve 30 with a seat 31, cut in thevalve 23 itself.

I This valve 30 is also provided with a stem .32, the diameter .of whichis less than that of opening 33, providing a second annular space 34.Fixed to the lower end of the stem is a flange which flange upon risingengages small protuberances 36 which hold it from, sealing the annularair passage, thus providing a second additional air passage when bothvalve members are fully lifted by the suction fromthe cylinders.

In operation the larger valve lifts first, carryi with it the smallervalve inoperative. pon increased demand for more air thesmaller valveautomatically rises, admittinIgai-r through the second annular space.

I pending ilom21 is a hollow tubular member 37, provided with a flange38. The flange 38 acts as a bafllefor retarding the flow of air into theu )per part of the sleeve 16,

Just above the flange 38 are provided open ings 39 and 4.0 in the wallsof the tubular member 37. Fixed to the bottom plate 14 is athermalexpansion unit generally designated 41, the design of which ismore or less standard, and does not enter here except that it isprovided with a top surface 42, which receives the full travel of theexpansion, At-,

inched to this late substantially in the center is a screw t n'eadedfixture 43 into which is screwed apin44 hollowed at the upper n as a45.- a

a Heles 46 and 47 are cut the walls of the hollowed portion in such amanner as to coincide. with holes 39 and vrespectively.

These holes 46 and 4'? are larger in' diameter than holes 39 and 40 andare so placedthat a p rt on f h holes 3 d 4 s 4 and 47, c ncid henhe thes a is c ld and the r er d am t r is t e le h h rm stat a long r movemnt and st ll keep the hate lignment.- F om this it is e ident that anopening always exists, but is small when the engine is cold, and fullyopened when the engine is hot.

In Figure 3 is exemplified a condition where the thermostat hasresponded to heat and pushed the pin 44 up into the tubular member 37,until the holes 46 and 47 coincide with the holes 39 and 40respectively, thereby fully opening an air passage to the interior of37. The hot air then would rush in through openings 48 in the bottomplate 14, which is also the top of the oven, past the flange 38, whichis a loose lit in the cylinder and acts as a baffle, and through theopenings 39 and 40 on into the interior of the tubular member 37.' Fromthere it passes through the valves 23, and during high speeds of theengine also valve 30, and on through the connection 10 to the flange 11.

' Provided in flange 11 is a bafile plate 49, which serves as breaker.As the mixture composed. of linely divided gasoline globules carried insuspension is swept along the manifold tube, and as the auxiliary air isadmitted to this stream just in front of this baffle plate it is easy toconceive that a much better mixture is obtained by causing a disturbanceat the point where the air is admitted. It not only causes the mixtureto become more rarefied, but it tends to make a more uniform mixturesince the globules are broken into more minute parts and the new air isthoroughly stirred in by the disturba ce- I The accompanying drawingsshow one embodiment of our invention and since it is possible to applyit in various ways we unf derstand we are entitled to such modificationsand, variations as do not depart from the scope of the description andappended claims. 1

We claim: v

1. A device of the type described, comprising in combination an exhaustpipe, a heating ,oven surrounding said pipe, means disposed the top ofsaid oven for receiving heated air from the oven, an intake manifold,communications between said means and said manifold for conveying heatedair to said manifold, said. manifold having a large opening forreceiving theheated air, and a bafile plate dispoSGfi adjacent to saidopening and on the side nearest the engine intake ports, and extendingpart way into the manifold.

2. A temperature controlled suction-actuated air inlet device comprisingan oven for enclosingthe exhaust pipe of an engine, a chamber forreceiving heated air from the even, a thermostat mounted in said chamberand affected by the heated air, a conduit for carrying the heated airfrom the ,oven to the intakemanifdd and a valve actuated by saidthermostat for permitting a greater vquantity th eted a to ent r aid cnduit s th a perature of the air increases.

